HP Jornada 420 User Manual page 114

110 Hewlett-Packard Jornada 420 Palm-size PC
You can write letters in either uppercase or lowercase. How the
letter is interpreted and displayed depends on where you write it
in the input panel. For example, you can write a letter in
lowercase or uppercase, and it will appear in lowercase if you
write it in the lowercase letter area (abc) of the input panel.